I've had good results shooting 2400 in a 223 using a 45 grain Hornady Hornet bullet. Velocity was ~3000 fps and the smaller amount of powder kept the barrel cooler and helped reduce the muzzle blast. I don't have my reloading notes handy, but it seems that I was using somewhere around 13-15 grains of 2400, and even at 13, a double charge would not fit into the case.
John in Oregon
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